Hey there!
1st one- 1/2, 3/6= 1/2, 5/10= 1/2, 7/14= 1/2. This one IS proportional
2nd one= 1/3, 2/6= 1/3, 4/9= 4/9, 8/12=, 2/3. NOT proportional
3rd one- 2/5, 3/6= 1/2, 4/7= 4/7, 5/8= 8/8, NOT proportional
Last one- 1/2,1/3,1/4, 1/5, Not proportional
Therefore, your answer is the first one
Hope this helps! :)
